Configuration cfg1 = new Configuration()
    .setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLInnoDBDialect")
    .setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/test1")
    .setProperty("hibernate.order_updates", "true")
    .addResource("map1_1.hbm.xml")
    .addResource("map1_2.hbm.xml");
SessionFactory sessions1 = cfg1.buildSessionFactory();
Session session1 = sessions1.openSession();

Configuration cfg2 = new Configuration()
    .setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLInnoDBDialect")
    .setProperty("hibernate.connection.datasource", "java:comp/env/jdbc/test2")
    .setProperty("hibernate.order_updates", "true")
    .addResource("map2_1.hbm.xml")
    .addResource("map2_2.hbm.xml");
SessionFactory sessions2 = cfg2.buildSessionFactory();
Session session2 = sessions2.openSession();